Equity Method Investment and Note Receivable - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	May 31, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Schedule of Equity Method Investments [Line Items]
Pre-tax cash proceeds from divestiture of business		$ 0	$ 17	$ 30
Loss from equity method investment		177	0	0
Income tax, benefit		(599)	(549)	(346)
Interest income		227	34	10
Related Party
Schedule of Equity Method Investments [Line Items]
Proceeds from related party note receivable		918	0	0
Payment of related party note payable		918	$ 0	$ 0
Copeland
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ 1,359	1,162
Notes receivable	$ 2,052	2,093
Loss from equity method investment		177
Income tax, benefit		$ 43
Loss from equity method investment (in dollars per share)		$ 0.24
Proceeds from related party note receivable		$ 918
Payment of related party note payable		918
Copeland | Related Party
Schedule of Equity Method Investments [Line Items]
Interest income		$ 41
Copeland
Schedule of Equity Method Investments [Line Items]
Noncontrolling common equity interest	40.00%
Copeland
Schedule of Equity Method Investments [Line Items]
Pre-tax cash proceeds from divestiture of business	$ 9,700
Notes receivable, consideration	$ 2,250